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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (30.7) | $ (33.4) | $ (30.7) | $ (33.3)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (0.1) | (0.1) |  |
Pension Plan [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (41.9) | (46.5) | (42.0) | (46.5)
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.1 | 0.0 |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 11.2 | 13.1 | $ 11.3 | $ 13.3
Other Postretirement Benefits Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ (0.1) | $ (0.1) |  |

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